Today we learned the difference between a local account and a domain account. A local account is for the local machine and the domain account is for joining the domain account using active directory which is a database of users and the permissions they have for the domain.
We also learned about the pros and cons of the different Redundant Array of Inexpensive/Independent Disks (RAID) arrays namely span, mirror, stripe, stripe with parity and hybrid.
Finally, Alex discussed low level format, partitions, formatting and different file systems such as FAT32, NTFS, EXT 3/4, etc.